[#488] reputation/managers: Implement route builders

Add implementation of Builder interface for
intermediate trusts. Move all code associated
with managers to `common` directory in `cmd`
and `pkg/services/reputation`

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/reputation/common/deps.go

@@ -5,6 +5,7 @@ import (
 	"io"
 
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common/router"
 )
 
 // Context wraps stdlib context
@@ -53,3 +54,11 @@ type WriterProvider interface {
 	// contexts, so specific ones may document their own behavior.
 	InitWriter(Context) (Writer, error)
 }
+
+// ManagerBuilder defines an interface for providing a list
+// of Managers for specific epoch. Implementation depends on trust value.
+type ManagerBuilder interface {
+	// BuildManagers must compose list of managers. It depends on
+	// particular epoch and PeerID of the current route point.
+	BuildManagers(epoch uint64, p reputation.PeerID) ([]router.ServerInfo, error)
+}

pkg/services/reputation/eigentrust/routes/builder.go

@@ -1,6 +1,10 @@
-package managers
+package routes
 
-import "fmt"
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
+)
 
 // Prm groups the required parameters of the Builder's constructor.
 //
@@ -11,7 +15,7 @@ type Prm struct {
 	// Manager builder for current node.
 	//
 	// Must not be nil.
-	ManagerBuilder ManagerBuilder
+	ManagerBuilder common.ManagerBuilder
 }
 
 // Builder represents component that routes node to its managers.
@@ -21,7 +25,7 @@ type Prm struct {
 // and optional components. After successful creation,
 // the Builder is immediately ready to work through API.
 type Builder struct {
-	managerBuilder ManagerBuilder
+	managerBuilder common.ManagerBuilder
 }
 
 const invalidPrmValFmt = "invalid parameter %s (%T):%v"

pkg/services/reputation/eigentrust/routes/calls.go

@@ -0,0 +1,23 @@
+package routes
+
+import (
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
+	reputationroute "github.com/nspcc-dev/neofs-node/pkg/services/reputation/common/router"
+	"github.com/pkg/errors"
+)
+
+// NextStage builds Manager list for trusted node and returns it directly.
+//
+// If passed route has more than one point, then endpoint of the route is reached.
+func (b *Builder) NextStage(epoch uint64, t reputation.Trust, passed []reputationroute.ServerInfo) ([]reputationroute.ServerInfo, error) {
+	if len(passed) > 1 {
+		return nil, nil
+	}
+
+	route, err := b.managerBuilder.BuildManagers(epoch, t.Peer())
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not build managers for epoch: %d", epoch)
+	}
+
+	return route, nil
+}

pkg/services/reputation/local/managers/deps.go

@@ -1,14 +0,0 @@
-package managers
-
-import (
-	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
-	reputationrouter "github.com/nspcc-dev/neofs-node/pkg/services/reputation/common/router"
-)
-
-// ManagerBuilder defines an interface for providing a list
-// of Managers for specific epoch. Implementation depends on trust value.
-type ManagerBuilder interface {
-	// BuildManagers must compose list of managers. It depends on
-	// particular epoch and PeerID of the current route point.
-	BuildManagers(epoch uint64, p reputation.PeerID) ([]reputationrouter.ServerInfo, error)
-}

pkg/services/reputation/local/routes/builder.go

@@ -0,0 +1,52 @@
+package routes
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/services/reputation/common"
+)
+
+// Prm groups the required parameters of the Builder's constructor.
+//
+// All values must comply with the requirements imposed on them.
+// Passing incorrect parameter values will result in constructor
+// failure (error or panic depending on the implementation).
+type Prm struct {
+	// Manager builder for current node.
+	//
+	// Must not be nil.
+	ManagerBuilder common.ManagerBuilder
+}
+
+// Builder represents component that routes node to its managers.
+//
+// For correct operation, Builder must be created using
+// the constructor (New) based on the required parameters
+// and optional components. After successful creation,
+// the Builder is immediately ready to work through API.
+type Builder struct {
+	managerBuilder common.ManagerBuilder
+}
+
+const invalidPrmValFmt = "invalid parameter %s (%T):%v"
+
+func panicOnPrmValue(n string, v interface{}) {
+	panic(fmt.Sprintf(invalidPrmValFmt, n, v, v))
+}
+
+// New creates a new instance of the Builder.
+//
+// Panics if at least one value of the parameters is invalid.
+//
+// The created Builder does not require additional
+// initialization and is completely ready for work.
+func New(prm Prm) *Builder {
+	switch {
+	case prm.ManagerBuilder == nil:
+		panicOnPrmValue("ManagerBuilder", prm.ManagerBuilder)
+	}
+
+	return &Builder{
+		managerBuilder: prm.ManagerBuilder,
+	}
+}

pkg/services/reputation/local/routes/calls.go

@@ -1,4 +1,4 @@
-package managers
+package routes
 
 import (
 	"github.com/nspcc-dev/neofs-node/pkg/services/reputation"
@@ -6,7 +6,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-// NextStage builds Manager list for node and returns it directly.
+// NextStage builds Manager list for trusting node and returns it directly.
 //
 // If passed route has more than one point, then endpoint of the route is reached.
 func (b *Builder) NextStage(epoch uint64, t reputation.Trust, passed []reputationroute.ServerInfo) ([]reputationroute.ServerInfo, error) {